Although systematic reviews suggest the potential effectiveness of in-service learning (i.e. volunteering) and youth development as approaches to preventing teenage pregnancy, no intervention involving toddler-mentoring has been previously evaluated. Teens and Toddlers (T&T) is an intervention that enables young people at risk of teenage pregnancy to spend time mentoring a toddler as well as participating in counselling and classroom work focused on youth development. This trial aims to answer the following research questions: